Electrochemical behaviour of lead in hydrochloric acid solution in the presence of inorganic ions

Authors

1 Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences, Université Mohammed Premier, B.P. 717, 60 000 Oujda,Morocco

2 Laboratoire d'Ingénierie des Procédés de l’Energie et de l’Environnement, Equipe Génie de l’Environnement et de Biotechnologie, Ecole National des Sciences Appliquées, BP 1136, Agadir,

3 Laboratoire Matériaux & Environnement, Equipe de Chimie Physique Appliquées, Faculté des Sciences, BP 8106, Agadir - Morocco

Abstract

The electrochemical behaviour of lead electrode in hydrochloride solution containing various
oxo-anions at different concentrations was studied by using of cyclic voltammetry (CV) method.
Results obtained show that the addition of these inorganic compounds decreases the anodic and
cathodic currents peaks according to the following order: H2PO4
- > HPO4
2-> SO4
2-. It’s revealed
also that the cathodic current density related to the reduction of Pb2+ ions dissolved in solution
decreases with the oxo-anions concentration. When the addition of sulphates ions concentration
reaches 0.34 mol L-1, the formation of PbSO4 is highly favoured. Therefore, the interstices
between the crystals of PbSO4 encourage the dissolution of lead and the formation of insoluble
PbCl2 layer on the lead surface involving the passivation phenomenon.

Keywords


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